Toxic air pollutants are poisonous substances in the air that come from natural sources (for example, radon gas coming up from the ground) or from manmade sources (for example, chemical compounds given off by factory smokestacks) and can harm the environment or your health.
Subsequently, Scorpius X-1 was discovered in 1962 by a team, under Riccardo Giacconi, who launched an Aerobee 150 sounding rocket carrying a highly sensitive soft X-ray detector designed by Frank Paolini.
The story of Europiumâs discovery begins with the discovery of another element â samarium. French chemist Paul-Ãmile Ã©mile lecoq De boisbaudran claimed to have isolated samarium in; 1879 others believed that one or more other new rare earth elements were present Inâboisbaudran s. sample